Given that the device is designed to be as hassle-free as possible, I was wondering why this function is offered?
When selecting a route (previsously created on PC), you have the option to select/edit/remove a waypoint (or trackpoint, if you like).
I wonder if this isn't an over-engineered solution? After all, when you have no map, no PC, no coordinates, on which base will you add/edit/remove a point? Since you don't have an idea where the trackpoint is, which trackpoint you are changing, and which coordinates to use when changing it?
The only possible reason I can think of is entering a specific location to be visited while you're navigating (such as a geocache)... but even then, how will you know which trackpoint to change, given that you don't have any reference points?
It would only make sense if you're doing so when sitting next to a PC with the Travel Software running, so you can actually see which trackpoint to change... which defeates the point.